Pulse or digital communications – Pulse code modulation – Differential
Patent
1993-04-13
1996-04-23
Chin, Stephen
Pulse or digital communications
Pulse code modulation
Differential
375254, H04B 1406
Patent
active
055110959
ABSTRACT:
The present invention relates to an audio signal coding and decoding device for coding and decoding an audio signal using an adaptive differential coding system. The audio signal coding and decoding device according to the present invention comprises an adaptive differential pulse code modulation coding device for coding an audio signal, an adaptive differential pulse code modulation decoding device for decoding the audio signal coded, an integrator provided in the preceding stage of the coding device and for decreasing the variation between unit samples of the input audio signal of the coding device, and a differentiator provided in the succeeding stage of the decoding device and for processing the audio signal decoded by the decoding device so that the variation decreased by the integrator is restored to the original one. Since the integrator is provided in the preceding stage of the coding device, the variation between the unit samples of the input audio signal of the coding device is decreased. Therefore, a prediction error signal obtained by the coding device is decreased. As a result, quantizer step-size is decreased, resulting in a reduced quantization error.
REFERENCES:
patent: 4368487 (1983-01-01), Sabri
patent: 4518950 (1985-05-01), Petr
patent: 4592070 (1986-05-01), Chow et al.
patent: 4672441 (1987-06-01), Hoelzlwimmer et al.
patent: 5230060 (1993-07-01), Naitoh
Inoue Takeo
Nishida Hideharu
Sugishita Shozo
Tsukihashi Akira
Chin Stephen
Phan Hai H.
Sanyo Electric Co,. Ltd.
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